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GradeShift UDL Instruction Manual

Last updated 22/03/2018

1. Quick Guide

Figure 1 - GradeShift UDL


Figure 2 - LED Indications




Use a Signal Analyser (available from the CSL shop) to determine if sufficient base stations are available at the site and that they can supply sufficient signal strength. This will determine the optimum location for the DualCom’s aerial to be mounted.




a. Ensure the aerial is mounted and connected in the correct position to achieve maximum signal strength. Apply power and wait for 5-8 minutes for the unit to connect to the network and download its programming file. Once completed the Green Signal Strength LED should be on or flashing, indicating an acceptable signal, the Red Fault LED should be off and the Blue Ready LED will be on. A percentage will also be shown on the SSD (Seven Segment Display) which should be 40% or higher. Now the GradeShift can be located into a suitable enclosure for the grade of installation.

b. Wire the input triggers, attach the RS232/485 cable or connect the Control Panel’s Digi-Modem PSTN terminals to the GradeShift’s Dial Capture terminals (refer to wiring diagrams in Section 2 of this document). For a dual path device remember to connect for PSTN or LAN.

c. Connect the fault output terminals to the Control Panel as required (refer to wiring diagrams in Section 2 of this document).

d. Power down the the Power Supply Unit (PSU), connect 9-30volts DC supply to the GradeShift’s power terminals and repower the PSU. Note that any voltage below 12v will indicate a low battery warning.

e: For installations using Dial Capture no GradeShift configuration is required. Simply check that your Digi-Modem has an ARC telephone number (ie 01) and an account number (ie 1234), select your signalling format, connect the GradeShift and test.

f. For pin triggering installations, ensure that the panel is in its normal state then press and hold the Test/Learn button for 3 seconds until the Green Signal Strength LED and the Yellow Communications LED flash alternately. Please note it is recommended that this step is not carried out until the instructions above has been completed. 


To send test signals, tap the Test/Learn button (less than 1 second). The 7 SSD should change to c1, c2, c3, A. (A = the Gemini Platform acknowledges the alarm signal). Simultaneously, the Yellow Communications LED indicates comms progress. If available, GradeShift will test the secondary (wired) path using C1, C2, C3, A to indicate successful communication.

If the test is not successful the Red Fault LED will light for 2-3 seconds at the end of the sequence. The GradeShift will make multiple call attempts if unsuccessful.

To self-learn the inputs, push the Test/Learn button for 3-5 seconds. ‘Pi’ will be displayed during the self-learn process.


Once you have successfully tested your GradeShift, make sure that you check with your ARC to see that they are receiving signals. This can be achieved by calling your ARC or using their web based secure platform.




Ensure you wire the fault output in accordance with the standard you wish to adhere to. For further information on the different options please follow the wiring diagrams in Section 2 and the full Installation Manual available via the Installer Zone on the CSL website: www.csldual.com/installer-zone


To enable/disable PSTN use the following A & B button sequence:

To enable/disable LAN:

INCREASE PSTN/RADIO FAIL (for 10 mins – engineer mode):


If you want to monitor the Dial Capture connection, connect an output configured as PSTN line fault on your Control Panel to one of the GradeShift’s inputs. Designate that input as Dial Capture fail at your ARC. For wiring instructions see Section 2.

RS232/485: for installations using RS232 or RS485 simply follow the wiring diagrams in Section 2.

LAN: For installations using LAN as a communication path connect a Cat5 (or higher).



In the operation, GradeShift is triggered by applying or removing zero volts to the input terminals 1-12. No external pull-up resistors will be required. This is generally achieved via the digital communicator outputs of an intruder alarm or similar Control Panel. GradeShift will signal alarm conditions and will generate the relevant messages and forward them via Gemini to the ARC. Installers are advised that the intended use should avoid situations where the rate of triggering exceeds the
rate at which messages may be sent to, or received by, the ARC receiver.


In this operation, GradeShift simulates and replaces the phone line connection to the Control Panel’s Digi-Modem.

The Control Panel’s Digi-Modem must use one of the following alarm formats: Fast Format, Contact ID or SIA. In the event the
Control Panel needs to send a signal to the ARC, GradeShift will capture the message and forward it, via Gemini, to the ARC. The Digi-Modem must have an ARC telephone number (ie 01) and account number (ie 1234) programmed for Dial Capture to

If you want to monitor the Dial Capture connection, you will need to connect an output configured as PSTN line fault on your Control Panel to one of the GradeShift’s inputs. That input then needs to be designated as Dial Capture Fail at your ARC.

2.3 PSTN

2.4 RS232/485

For further instructions on Control Panel programming please review the how to guides on the Installer Zone of our website: www.csldual.com/installer-zone




Q. The Red Fault LED is continuously flashing, what does this mean?

A. This happens when the unit is first powered and needs to download its configuration file from the Gemini Platform which can take 5-8 minutes. You must ensure that the Yellow Service (SVC) LED is flashing every 3-5 seconds, which indicates that the unit is connected to the mobile network.

Q. The GradeShift repeats the ‘power-up’ sequence but never completes it.

A. The power supply has a low output voltage or is unable to supply the current required by the GradeShift when it is activated. Check the power supply with a multimeter. Also, test the GradeShift’s operation when powered by a ‘known good’ 12 volt battery.

Q. The Red Fault LED is on, what is the problem?

A. Please refer to the error code on the SSD and the error code list at the end of this document.

Q. Triggering via ‘Dial Capture’ does not seem to work.

A. During communication between the Control Panel and the GradeShift, the display should show ‘DC’. If ‘DC’ is displayed, but c1, c2, c3, A is not, the panel may not be compatible or is configured to send a protocol that GradeShift does not recognise. If available, check the Control Panel’s programming and select an alternate signalling format. Please check our online compatibility table for the latest list of compatible Control Panels and formats: www.csldual.com.

Q. The ARC is not receiving messages.

A. In most cases the GradeShift will explain the reason a signal cannot be sent to your ARC using an error code shown on the SSD. If, after trying to rectify the displayed fault, the GradeShift can still not transmit to your ARC please contact CSL Technical Support.


In the event of an issue the GradeShift will display an error code on the SSD. This is the letter ‘E’ followed by a number. A list of error codes is shown on pages 10 and 11 along with the potential solution. During operation, an Error Code may be displayed for up to 4 minutes. During this time, if the fault is corrected, or another error of higher priority occurs then the display will indicate the new value.

Critical Errors:
To alert the User and Installer to critical error conditions, after the normal sounder beeps have timed out the GradeShift unit will continue to beep once every 5 minutes.


For assistance please telephone or email our CSL Technical Support. Before doing so please review the Installation Manual and How To Guides on the Installer Zone of our website: www.csldual.com/installer-zone

UK Tel: +44 (0)1895 474 444
Ireland Tel: 1800 855 695
Netherlands Tel: 010 - 714 54 93
Email: support@csldual.com
Hours: 08.30 to 18.00 weekdays, 10.00 to 16.00 Saturday (all times GMT)


All the products below are available to order via your ARC or the CSL Installer Shop.


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